OPUNTIA. 95 



several, i cm. long or less; glochids at first inconspicuous, but in time very abundant, sometimes 2 

 cm. long, somewhat persistent; flowers not known ; fruit globular, 2 to 2.5 cm. in diameter, spineless; 

 seeds pale, 4 mm. broad. 



Collected by J. N. Rose and Paul G. Russell on the dry hills at Potrerillos, Mendoza, 

 Argentina, September 2, 1915 (No. 21002). 



This is a common species in the foothills of the Andes, in the Province of Mendoza, 

 where it forms low mounds along with other cacti. 



Figure 1 1 1 represents joints of the type specimen above cited. 



68. Opuntia corrugata Salm-Dyck, Hort. Dyck. 360. 1834. 



Opuntia eburnea Lemaire, Cact. Aliq. Nov. 35. 1838. 

 Opuntia retrospinosa Lemaire, Cact. Aliq. Nov. 35. 1838. 

 Opuntia parmentieri Pfeiffer, Allg. Gartenz. 6: 276. 1838. 



More or less cespitose; joints 3.5 cm. long, 8 to 12 mm. in diameter, orbicular to cylindric, often 

 erect, attenuate at both ends, light green, the terminal one often flattened; glochids minute, yel- 

 lowish; spines 6 to 8, acicular, 8 to 12 mm. long, white; flowers reddish; fruit red. 



Type locality: None given. 



Distribution: Northwestern Argentina, according to later writers. 



Lemaire (Cact. 88. 1868) uses the names Cactus corrugatus and C. cburneus, both of 

 which Schumann refers here. 



Tephrocactus retrospinosus Lemaire (Cact. 88. 1868) is placed by Lemaire in his third 

 section of Tephrocactus, but it is without description. It is doubtless the same as Opuntia 

 retrospinosa Lemaire, which belongs here. 



Opuntia aulacothclc Weber (Gosselin, Bull. Mus. Hist. Nat. Paris 10:392. 1904), 

 which was described without flowers or fruit, may be of this alliance. It comes from San 

 Rafael, Argentina. 



Opuntia cornigata, mentioned in Bailey's Standard Cyclopedia of Horticulture (4: 2367 . 

 1916), is a misspelling of this name. 



Opuntia corrugata monvillei Salm-Dyck (Cact. Hort. Dyck. 1849. 72. 1850) was not 

 described. 



Opuntia longispina Haworth (Phil. Mag. 7: in. 1830), when first described, was sup- 

 posed to have come from Brazil; the Index Kewensis refers it to Chile; while Schumann 

 treats it in a note under 0. corrugata as an Argentine species. It may not be an Opuntia 

 but a Maihuenia. 



69. Opuntia ovata Pfeiffer, Enum. Cact. 144. 1837. 



Opuntia ovallei Remy in Gay, Fl. Chilena 3: 29. 1847. 

 Opuntia grata Philippi, Linnaea 30: 211. 1859. 

 Opuntia monticola Philippi, Linnaea 33: 82. 1864. 



Low, branching, cespitose plants; joints yellowish green, 

 some deep purple when young, subcylindric to ellipsoid, 3 

 cm. long; spines 5 to 9, 4 to 10 mm. long, when young brown- 

 ish, in age white; fruit ovoid; umbilicus curved outward. 



Type locality: Mendoza, Argentina. 



Distribution: Mountains of Argentina and Chile. FIG. 112. Opuntia ovata. xo, 5 . 



Opuntia ovoidcs Lemaire (Cact. Gen. Nov. Sp. 73. 1839) and Cactus ovoidcs Lemaire 

 (Cact. 88. 1868) are usually cited as synonyms for Opuntia ovata; they are unpublished names. 



This species forms low clumps, each branch consisting of 2 to 5 joints. Dr. Rose found 

 it abundant in the Andes above Mendoza and it has also been reported from the Chilean 

 side of the Andes. Colonies differ in armament. In cultivation some of the joints are 

 elongated and club-shaped. 



Illustration: Schumann Gesamtb. Kakteen f. 105, as Opuntia grata. 

 Figure 112 shows joints of the plant collected by Dr. Rose in 1915 at Potrerillos, 

 Argentina. 



